Question

Is there any event that fires, when a win form’s listview top item property changes?

Answer 1

There is no event specifically for the TopItem property. However you should be able to get the same effect by caching the previous TopItem result and comparing it on other events which are indicators of item reordering: Paint and DrawItem for example.

private void WatchTopItemChanged(ListView listView, Action callOnChanged) {
  var lastTopItem = listView.TopItem;
  listView.DrawItem += delegate {
    if (lastTopItem != listView.TopItem) {
      lastTopItem = listView.TopItem;
      callOnChanged();
    }
  };
}